I got over the issues with frilly binding/puckering by unpicking that section of quilting and cutting out the bit of wadding I'd previously unsuccessfully joined. I cut a new larger section of wadding and hand joined the sections together. There is a slight over lap which you could probably feel if you decided to feel up and down the length of the quilt. But really who does that? I am happy with how it's turned out and can't wait to get the quilt on my bed.
Despite having enough binding left to bind several cushions I didn't opt to do this in the end. As a result the pillow form I have is slightly too small than I'd planned on. I think it'll make a nice addition to my bed.
Now I'm going to have a bit of a rest and then crack on with some bee blocks. I might get that super tote finished this weekend after all!